Changes

where <math>c^2</math> is square of speed of light in vacuum adjusted by <math>(d\tau/dt)</math> (ratio of proper time to coordinate time<ref>

where <math>c^2</math> is square of speed of light in vacuum adjusted by <math>(d\tau/dt)</math> (ratio of proper time to coordinate time<ref>

This ratio is expressed sometimes as <math>\sqrt{-g_{oo}}</math>, where <math>-g_{oo}</math> is time-time component of metric of spacetime) which means that <math>c^2 \sqrt{-g_{oo}}</math> is not a constant but a function of time and we may take its non vanishing derivative with respect to time.

This ratio is expressed sometimes as  

:<math>d\tau/dt=\sqrt{-g_{oo}}</math>,  

where <math>(-g_{oo})</math> is time-time component of metric of spacetime, which means that <math>mc^2 \sqrt{-g_{oo}}</math> is not a constant but a function of time and we may take its non vanishing derivative with respect to time to calculate gravitational force.

</ref>) and <math>m</math> is rest mass of a particle though the equation works also for ''[[relativistic mass]]'' with just the energy increased by kinetic energy of the particle, it turned out that this mysterious force of alleged ''attraction'' comes just as derivative of the above equation with respect to displacement of the particle <math>dx</math>.  

</ref>) and <math>m</math> is rest mass of a particle though the equation works also for ''[[relativistic mass]]'' with just the energy increased by kinetic energy of the particle, it turned out that this mysterious force of alleged ''attraction'' comes just as derivative of the above equation with respect to displacement of the particle <math>dx</math>.